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Baù E, Gölz T, Benoit M, Tittl A, Keilmann F. Nanoscale Mechanical Manipulation of Ultrathin SiN Membranes Enabling Infrared Near-Field Microscopy of Liquid-Immersed samples. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2402568. [PMID: 39148207 DOI: 10.1002/smll.202402568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2024] [Revised: 07/30/2024] [Indexed: 08/17/2024]
Abstract
Scattering scanning near-field optical microscopy (s-SNOM) is a powerful technique for mid-infrared spectroscopy at nanometer length scales. By investigating objects in aqueous environments through ultrathin membranes, s-SNOM has recently been extended toward label-free nanoscopy of the dynamics of living cells and nanoparticles, assessing both the optical and the mechanical interactions between the tip, the membrane and the liquid suspension underneath. Here, the study reports that the tapping AFM tip induces a reversible nanometric deformation of the membrane manifested as either an indentation or protrusion. This mechanism depends on the driving force of the tapping cantilever, which is exploited to minimize topographical deformations of the membrane to improve optical measurements. Furthermore, it is shown that the tapping phase delay between driving signal and tip oscillation is a highly sensitive observable to study the mechanics of adhering objects, exhibiting highest contrast at low tapping amplitudes where the membrane remains nearly flat. Mechanical responses are correlated with simultaneously recorded spectroscopy data to reveal the thickness of nanometric water layers between membrane and adhering objects. Besides a general applicability of depth profiling, the technique holds great promise for studying mechano-active biopolymers and living cells, biomaterials that exhibit complex behaviors when under a mechanical load.
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Affiliation(s)
- Enrico Baù
- Chair in Hybrid Nanosystems and Center for NanoScience, Nano-Institute Munich, Faculty of Physics, Ludwig-Maximilians-University, Königinstr. 10, 80539, München, Germany
| | - Thorsten Gölz
- Chair in Hybrid Nanosystems and Center for NanoScience, Nano-Institute Munich, Faculty of Physics, Ludwig-Maximilians-University, Königinstr. 10, 80539, München, Germany
| | - Martin Benoit
- Chair of Applied Physics, Molecular physics of life and Center for NanoScience, Faculty of Physics, Ludwig-Maximilians-University, Am Klopferspitz 18, 82152, Martinsried, Germany
| | - Andreas Tittl
- Chair in Hybrid Nanosystems and Center for NanoScience, Nano-Institute Munich, Faculty of Physics, Ludwig-Maximilians-University, Königinstr. 10, 80539, München, Germany
| | - Fritz Keilmann
- Chair in Hybrid Nanosystems and Center for NanoScience, Nano-Institute Munich, Faculty of Physics, Ludwig-Maximilians-University, Königinstr. 10, 80539, München, Germany
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2
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Czaja M, Chachaj-Brekiesz A, Skirlińska-Nosek K, Szajna K, Sofińska K, Lupa D, Kobierski J, Wnętrzak A, Szymoński M, Lipiec E. Fabrication of plasmonic probes for reproducible nanospectroscopic investigation of lipid monolayers - The electrochemical etching with DC-pulsed voltage. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 316:124323. [PMID: 38692104 DOI: 10.1016/j.saa.2024.124323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 04/12/2024] [Accepted: 04/21/2024] [Indexed: 05/03/2024]
Abstract
Tip-enhanced Raman spectroscopy (TERS) is a label-free analytical technique that characterizes molecular systems, potentially even with a nanometric resolution. In principle, the metallic plasmonic probe is illuminated with a laser beam generating the localized surface plasmons, which induce a strong local electric field enhancement in close proximity to the probe. Such field enhancement improves the Raman scattering cross-section from the sample volume localized near the probe apex. TERS provides a high spatial resolution and a great sensitivity, however, it is rather rarely used due to technical limitations causing unstable enhancement and the relative lack of data reproducibility. Despite many scientific efforts for the fabrication of effective TER probes providing robust TER enhancement still requires further investigations. In this work, we explore new possibilities based on preparation of scanning tunnelling microscopy (STM) plasmonic probes, since by nature of the tunnelling effect, they potentially could offer a very high spatial resolution in STM guided TERS experiments. Here we compare two methods of STM-TERS probe preparation for effective spectra acquisition. Our results strongly indicate that an application of square pulse voltage upon the etching procedure significantly improves the quality of the TER data over those obtained with a constant voltage one. To demonstrate the efficiency of our probes we present the results of hyperspectral TER mapping of the 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine (DPPE) monolayer deposited on an ultra-pure and atomically flat gold substrate.
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Affiliation(s)
- Michał Czaja
- Jagiellonian University, Faculty of Physics, Astronomy, and Applied Computer Science, M. Smoluchowski Institute of Physics, Łojasiewicza 11, Kraków 30-348, Poland; Jagiellonian University, Doctoral School of Exact and Natural Sciences, Kraków 30-387, Poland
| | - Anna Chachaj-Brekiesz
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, Kraków 30-387, Poland
| | - Katarzyna Skirlińska-Nosek
- Jagiellonian University, Faculty of Physics, Astronomy, and Applied Computer Science, M. Smoluchowski Institute of Physics, Łojasiewicza 11, Kraków 30-348, Poland; Jagiellonian University, Doctoral School of Exact and Natural Sciences, Kraków 30-387, Poland
| | - Konrad Szajna
- Jagiellonian University, Faculty of Physics, Astronomy, and Applied Computer Science, M. Smoluchowski Institute of Physics, Łojasiewicza 11, Kraków 30-348, Poland
| | - Kamila Sofińska
- Jagiellonian University, Faculty of Physics, Astronomy, and Applied Computer Science, M. Smoluchowski Institute of Physics, Łojasiewicza 11, Kraków 30-348, Poland
| | - Dawid Lupa
- Jagiellonian University, Faculty of Physics, Astronomy, and Applied Computer Science, M. Smoluchowski Institute of Physics, Łojasiewicza 11, Kraków 30-348, Poland
| | - Jan Kobierski
- Jagiellonian University Medical College, Faculty of Pharmacy, Department of Pharmaceutical Biophysics, Medyczna 9, Kraków 30-688, Poland
| | - Anita Wnętrzak
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, Kraków 30-387, Poland
| | - Marek Szymoński
- Jagiellonian University, Faculty of Physics, Astronomy, and Applied Computer Science, M. Smoluchowski Institute of Physics, Łojasiewicza 11, Kraków 30-348, Poland
| | - Ewelina Lipiec
- Jagiellonian University, Faculty of Physics, Astronomy, and Applied Computer Science, M. Smoluchowski Institute of Physics, Łojasiewicza 11, Kraków 30-348, Poland.
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3
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de Carvalho LAEB, Cinque G, de Carvalho ALMB, Marques J, Frogley MD, Vondracek H, Marques MPM. Synchrotron nano-FTIR spectroscopy for probing anticancer drugs at subcellular scale. Sci Rep 2024; 14:17166. [PMID: 39060284 PMCID: PMC11282259 DOI: 10.1038/s41598-024-67386-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2024] [Accepted: 07/10/2024] [Indexed: 07/28/2024] Open
Abstract
The cellular response to cisplatin was assessed in human osteosarcoma cells, using synchrotron-based (SR) Fourier Transform InfraRed nanospectroscopy (nano-FTIR) at the MIRIAM beamline B22 of Diamond Light Source (UK). This label-free mapping method delivered simultaneous morphological and biochemical information on a subcellular level (i.e. 100 s nanometer or better). Based on specific spectral biomarkers, the main biochemical constituents affected by the drug were identified at distinct locations within the cell´s inner body. Cisplatin was shown to have a noteworthy effect on proteins, mostly within the cytoplasm. A clear drug impact on cellular lipids was also observed. Within current literature on s-SNOM, this nanospectroscopy work represents a first successful application in life sciences providing full fingerprint nano-FTIR spectra across intact human cancer cells.
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Affiliation(s)
| | - Gianfelice Cinque
- Diamond Light Source, Harwell Science and Innovation Campus, Chilton - Didcot, OX11 0DE, Oxfordshire, UK.
- Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK.
| | | | - Joana Marques
- Department of Chemistry, Química-Física Molecular, University of Coimbra, 3004-535, Coimbra, Portugal
| | - Mark D Frogley
- Diamond Light Source, Harwell Science and Innovation Campus, Chilton - Didcot, OX11 0DE, Oxfordshire, UK
| | - Hendrik Vondracek
- Diamond Light Source, Harwell Science and Innovation Campus, Chilton - Didcot, OX11 0DE, Oxfordshire, UK
| | - Maria Paula M Marques
- Department of Chemistry, Química-Física Molecular, University of Coimbra, 3004-535, Coimbra, Portugal
- Department of Life Sciences, University of Coimbra, 3000-456, Coimbra, Portugal
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4
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Dopilka A, Larson JM, Cha H, Kostecki R. Synchrotron Near-Field Infrared Nanospectroscopy and Nanoimaging of Lithium Fluoride in Solid Electrolyte Interphases in Li-Ion Battery Anodes. ACS NANO 2024; 18:15270-15283. [PMID: 38788214 PMCID: PMC11171761 DOI: 10.1021/acsnano.4c04333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 04/26/2024] [Accepted: 05/03/2024] [Indexed: 05/26/2024]
Abstract
Lithium fluoride (LiF) is a ubiquitous component in the solid electrolyte interphase (SEI) layer in Li-ion batteries. However, its nanoscale structure, morphology, and topology, important factors for understanding LiF and SEI film functionality, including electrode passivity, are often unknown due to limitations in spatial resolution of common characterization techniques. Ultrabroadband near-field synchrotron infrared nanospectroscopy (SINS) enables such detection and mapping of LiF in SEI layers in the far-infrared region down to ca. 322 cm-1 with a nanoscale spatial resolution of ca. 20 nm. The surface sensitivity of SINS and the large infrared absorption cross section of LiF, which can support local surface phonons under certain circumstances, enabled characterization of model LiF samples of varying structure, thickness, surface roughness, and degree of crystallinity, as confirmed by atomic force microscopy, attenuated total reflectance FTIR, SINS, X-ray photoelectron spectroscopy, high-angle annular dark-field, and scanning transmission electron microscopy. Enabled by this approach, LiF within SEI films formed on Cu, Si, and metallic glass Si40Al50Fe10 electrodes was detected and characterized. The nanoscale morphologies and topologies of LiF in these SEI layers were evaluated to gain insights into LiF nucleation, growth, and the resulting nuances in the electrode surface passivity.
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Affiliation(s)
- Andrew Dopilka
- Energy
Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jonathan M. Larson
- Energy
Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Department
of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States
| | - Hyungyeon Cha
- Energy
Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Ulsan
Advanced Energy Technology R&D Center, Korea Institute of Energy Research (KIER), Nam-gu Ulsan 44776, Republic of Korea
| | - Robert Kostecki
- Energy
Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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5
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Burr DJ, Drauschke J, Kanevche K, Kümmel S, Stryhanyuk H, Heberle J, Perfumo A, Elsaesser A. Stable Isotope Probing-nanoFTIR for Quantitation of Cellular Metabolism and Observation of Growth-Dependent Spectral Features. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2400289. [PMID: 38708804 DOI: 10.1002/smll.202400289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 04/16/2024] [Indexed: 05/07/2024]
Abstract
This study utilizes nanoscale Fourier transform infrared spectroscopy (nanoFTIR) to perform stable isotope probing (SIP) on individual bacteria cells cultured in the presence of 13C-labelled glucose. SIP-nanoFTIR simultaneously quantifies single-cell metabolism through infrared spectroscopy and acquires cellular morphological information via atomic force microscopy. The redshift of the amide I peak corresponds to the isotopic enrichment of newly synthesized proteins. These observations of single-cell translational activity are comparable to those of conventional methods, examining bulk cell numbers. Observing cells cultured under conditions of limited carbon, SIP- nanoFTIR is used to identify environmentally-induced changes in metabolic heterogeneity and cellular morphology. Individuals outcompeting their neighboring cells will likely play a disproportionately large role in shaping population dynamics during adverse conditions or environmental fluctuations. Additionally, SIP-nanoFTIR enables the spectroscopic differentiation of specific cellular growth phases. During cellular replication, subcellular isotope distribution becomes more homogenous, which is reflected in the spectroscopic features dependent on the extent of 13C-13C mode coupling or to specific isotopic symmetries within protein secondary structures. As SIP-nanoFTIR captures single-cell metabolism, environmentally-induced cellular processes, and subcellular isotope localization, this technique offers widespread applications across a variety of disciplines including microbial ecology, biophysics, biopharmaceuticals, medicinal science, and cancer research.
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Affiliation(s)
- David J Burr
- Department of Physics, Experimental Biophysics and Space Sciences, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
| | - Janina Drauschke
- Department of Physics, Experimental Biophysics and Space Sciences, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
| | - Katerina Kanevche
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
- Department of Chemistry, Princeton University, Princeton, NJ, 08544, USA
| | - Steffen Kümmel
- Department of Technical Biogeochemistry, Helmholtz Centre for Environmental Research - UFZ, Permoserstraße 15, 04318, Leipzig, Germany
| | - Hryhoriy Stryhanyuk
- Department of Technical Biogeochemistry, Helmholtz Centre for Environmental Research - UFZ, Permoserstraße 15, 04318, Leipzig, Germany
| | - Joachim Heberle
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
| | - Amedea Perfumo
- Department of Physics, Experimental Molecular Biophysics, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems, Telegrafenberg, 14473, Potsdam, Germany
| | - Andreas Elsaesser
- Department of Physics, Experimental Biophysics and Space Sciences, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
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6
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Li J, Liang J, Lan MH, Xia XH. Atomic force microscopy-based nanoscale infrared techniques for liquid environments. Sci Bull (Beijing) 2024; 69:151-153. [PMID: 37993337 DOI: 10.1016/j.scib.2023.11.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2023]
Affiliation(s)
- Jian Li
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Jing Liang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Mu-Hao Lan
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Xing-Hua Xia
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
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7
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Nishida J, Otomo A, Koitaya T, Shiotari A, Minato T, Iino R, Kumagai T. Sub-Tip-Radius Near-Field Interactions in Nano-FTIR Vibrational Spectroscopy on Single Proteins. NANO LETTERS 2024; 24:836-843. [PMID: 38193723 DOI: 10.1021/acs.nanolett.3c03479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
Tip-enhanced vibrational spectroscopy has advanced to routinely attain nanoscale spatial resolution, with tip-enhanced Raman spectroscopy even achieving atomic-scale and submolecular sensitivity. Tip-enhanced infrared spectroscopy techniques, such as nano-FTIR and AFM-IR spectroscopy, have also enabled the nanoscale chemical analysis of molecular monolayers, inorganic nanoparticles, and protein complexes. However, fundamental limits of infrared nanospectroscopy in terms of spatial resolution and sensitivity have remained elusive, calling for a quantitative understanding of the near-field interactions in infrared nanocavities. Here, we demonstrate the application of nano-FTIR spectroscopy to probe the amide-I vibration of a single protein consisting of ∼500 amino acid residues. Detection with higher tip tapping demodulation harmonics up to the seventh order leads to pronounced enhancement in the peak amplitude of the vibrational resonance, originating from sub-tip-radius geometrical effects beyond dipole approximations. This quantitative characterization of single-nanometer near-field interactions opens the path toward employing infrared vibrational spectroscopy at the subnanoscale and single-molecule levels.
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Affiliation(s)
- Jun Nishida
- Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, Aichi 444-8585, Japan
- The Graduate Institute for Advanced Studies, SOKENDAI, Hayama, Kanagawa 240-0193, Japan
| | - Akihiro Otomo
- Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, Aichi 444-8585, Japan
- The Graduate Institute for Advanced Studies, SOKENDAI, Hayama, Kanagawa 240-0193, Japan
| | - Takanori Koitaya
- Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, Aichi 444-8585, Japan
| | - Akitoshi Shiotari
- Department of Physical Chemistry, Fritz-Haber Institute of the Max-Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Taketoshi Minato
- Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, Aichi 444-8585, Japan
| | - Ryota Iino
- Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, Aichi 444-8585, Japan
- The Graduate Institute for Advanced Studies, SOKENDAI, Hayama, Kanagawa 240-0193, Japan
| | - Takashi Kumagai
- Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, Aichi 444-8585, Japan
- The Graduate Institute for Advanced Studies, SOKENDAI, Hayama, Kanagawa 240-0193, Japan
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8
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Li Z, Lu X, Chang T, Wei D, Cui HL, Yan S. Countermeasure to cell dehydration caused terahertz near-field scanning image deterioration. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 304:123308. [PMID: 37659244 DOI: 10.1016/j.saa.2023.123308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 08/25/2023] [Accepted: 08/27/2023] [Indexed: 09/04/2023]
Abstract
Most biomedical applications of terahertz (THz) imaging are based on distinguishing the dielectric differences of tissues or cells in the THz band. But changes in bio-sample dehydration during the point-scanning process can lead to time-varying deviations in the imaging results. To eliminate the deviations, we proposed a time-varying dehydration kinetic model by analyzing the water diffusion process. The model is verified by experiments and applied to restore each point close to the initial imaging starting state of fresh cellular samples, compensating for the impact of slow speed point-scanning on image deterioration. This methodology has significantly improved the THz super-resolution imaging quality of fresh cellular samples, and successfully restored the cell contours that had been obscured by the cell dehydration over time. Although the dehydration model is developed in THz near-filed imaging, it also pertains to other spectral systems that operate in the raster-scan mode on fresh bio-samples.
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Affiliation(s)
- Zaoxia Li
- College of Instrumentation and Electrical Engineering, Jilin University, Changchun, Jilin 130061, China; Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Xingxing Lu
- College of Instrumentation and Electrical Engineering, Jilin University, Changchun, Jilin 130061, China; Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Tianying Chang
- College of Instrumentation and Electrical Engineering, Jilin University, Changchun, Jilin 130061, China; Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Dongshan Wei
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China
| | - Hong-Liang Cui
- College of Instrumentation and Electrical Engineering, Jilin University, Changchun, Jilin 130061, China; Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, China.
| | - Shihan Yan
- Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Science, Chongqing 400714, China.
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9
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Veber A, Zancajo VMR, Puskar L, Schade U, Kneipp J. In situ infrared imaging of the local orientation of cellulose fibrils in plant secondary cell walls. Analyst 2023; 148:4138-4147. [PMID: 37496329 DOI: 10.1039/d3an00897e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
The mechanical and chemical properties of plant cell walls greatly rely on the supramolecular assembly of cellulose fibrils. To study the local orientation of cellulose in secondary plant cell walls, diffraction limited infrared (IR) micro-spectroscopic mapping experiments were conducted at different orientation of transverse leaf section of the grass Sorghum bicolor with respect to the polarization direction of the IR radiation. Two-dimensional maps, based on polarization-sensitive absorption bands of cellulose were obtained for different polarization angles. They reveal a significant degree of anisotropy of the cellulose macromolecules as well as of other biopolymers in sclerenchyma and xylem regions of the cross section. Quantification of the signals assigned to polarization sensitive vibrational modes allowed to determine the preferential orientation of the sub-micron cellulose fibrils in single cell walls. A sample of crystalline nano-cellulose comprising both a single microcrystal as well as unordered layers of nanocrystals was used for validation of the approach. The results demonstrate that diffraction limited IR micro-spectroscopy can be used to study hierarchically structured materials with complex anisotropic behavior.
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Affiliation(s)
- Alexander Veber
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany.
- Institute for Electronic Structure Dynamics, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Victor M R Zancajo
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany.
| | - Ljiljana Puskar
- Institute for Electronic Structure Dynamics, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Ulrich Schade
- Institute for Electronic Structure Dynamics, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Janina Kneipp
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany.
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10
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Neto JG, Simon DA, Figueiredo K, Brandão ALT. Framework for data-driven polymer characterization from infrared spectra. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 300:122841. [PMID: 37269658 DOI: 10.1016/j.saa.2023.122841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 05/01/2023] [Accepted: 05/06/2023] [Indexed: 06/05/2023]
Abstract
Automating infrared spectra interpretation in microplastic identification is of interest since most current methodologies are conducted manually or semi-automatically, which requires substantial processing time and presents a higher accuracy limited to single-polymer materials. Furthermore, when it comes to multicomponent or weathered polymeric materials commonly found in aquatic environments, identification usually becomes considerably depreciated as peaks shift and new signals are frequently observed, representing a significant deviation from reference spectral signatures. Therefore, this study aimed to develop a reference modeling framework for polymer identification through infrared spectra processing, addressing the limitations above. The case study selected for model development was polypropylene (PP) identification, as it is the second most abundant material in microplastics. Therefore, the database comprises 579 spectra with 52.3% containing PP to some degree. Different pretreatment and model parameters were evaluated for a more robust investigation, totaling 308 models, including multilayer perceptron and long-short-term memory architectures. The best model presented a test accuracy of 94.8% within the cross-validation standard deviation interval. Overall, the results achieved in this study indicate an opportunity to investigate the identification of other polymers following the same framework.
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Affiliation(s)
- João G Neto
- Department of Chemical and Materials Engineering, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, 22451-900, RJ, Brazil
| | - Douglas A Simon
- Federal Institute of Education, Science and Technology of Rio Grande do Sul, Farroupilha, 95174-274, RS, Brazil
| | - Karla Figueiredo
- Department of Informatics and Computer Science, Institute of Mathematics and Statistics, Rio de Janeiro State University, Rio de Janeiro, 20550-900, RJ, Brazil
| | - Amanda L T Brandão
- Department of Chemical and Materials Engineering, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, 22451-900, RJ, Brazil.
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11
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Portius M, Danneberg C, Pompe T. Biomaterial approaches for engineering and analyzing structure and metabolic states of microbial consortia within biofilms. Curr Opin Biotechnol 2023; 81:102916. [PMID: 36870250 DOI: 10.1016/j.copbio.2023.102916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 01/25/2023] [Accepted: 02/03/2023] [Indexed: 03/06/2023]
Abstract
Microbial consortia within biofilms are frequently found in structured organization in nature and are thought to bear great potential for productive biotechnological applications, such as the degradation of complex substrates, biosensing, or the production of chemical compounds. However, in-depth understanding of their organizational principles, as well as comprehensive design criteria of structured microbial consortia for industrial applications are still limited. It is hypothesized that biomaterial engineering of such consortia within scaffolds can advance the field by providing defined in vitro mimics of naturally occurring and industrially applicable biofilms. Such systems will allow for adjustment of important microenvironmental parameters and in-depth analysis with high temporal and spatial resolution. In this review, we provide the background of biomaterial engineering of structured biofilm consortia, show approaches for their design, and demonstrate tools to analyze their metabolic state.
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Affiliation(s)
- Matthias Portius
- Institute of Biochemistry, Leipzig University, Germany; Research and Transfer Center for Bioactive Matter, bioACTmatter, Leipzig University, Germany
| | | | - Tilo Pompe
- Institute of Biochemistry, Leipzig University, Germany; Research and Transfer Center for Bioactive Matter, bioACTmatter, Leipzig University, Germany.
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12
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Král M, Dendisová M, Matějka P, Svoboda J, Pop-Georgievski O. Infrared imaging of surface confluent polydopamine (PDA) films at the nanoscale. Colloids Surf B Biointerfaces 2023; 221:112954. [DOI: 10.1016/j.colsurfb.2022.112954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 10/13/2022] [Accepted: 10/18/2022] [Indexed: 11/06/2022]
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13
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In vitro investigation of protein assembly by combined microscopy and infrared spectroscopy at the nanometer scale. Proc Natl Acad Sci U S A 2022; 119:e2200019119. [PMID: 35914130 PMCID: PMC9371722 DOI: 10.1073/pnas.2200019119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The nanoscale structure and dynamics of proteins on surfaces has been extensively studied using various imaging techniques, such as transmission electron microscopy and atomic force microscopy (AFM) in liquid environments. These powerful imaging techniques, however, can potentially damage or perturb delicate biological material and do not provide chemical information, which prevents a fundamental understanding of the dynamic processes underlying their evolution under physiological conditions. Here, we use a platform developed in our laboratory that enables acquisition of infrared (IR) spectroscopy and AFM images of biological material in physiological liquids with nanometer resolution in a cell closed by atomically thin graphene membranes transparent to IR photons. In this work, we studied the self-assembly process of S-layer proteins at the graphene-aqueous solution interface. The graphene acts also as the membrane separating the solution containing the proteins and Ca2+ ions from the AFM tip, thus eliminating sample damage and contamination effects. The formation of S-layer protein lattices and their structural evolution was monitored by AFM and by recording the amide I and II IR absorption bands, which reveal the noncovalent interaction between proteins and their response to the environment, including ionic strength and solvation. Our measurement platform opens unique opportunities to study biological material and soft materials in general.
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Choi B, Jeong G, Shin HH, Kim ZH. Molecular vibrational imaging at nanoscale. J Chem Phys 2022; 156:160902. [PMID: 35490022 DOI: 10.1063/5.0082747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The demand to visualize the spatial distribution of chemical species based on vibrational spectra is rapidly increasing. Driven by such a need, various Raman and infrared spectro-microscopies with a nanometric spatial resolution have been developed over the last two decades. Despite rapid progress, a large gap still exists between the general needs and what these techniques can achieve. This Perspective highlights the key challenges and recent breakthroughs of the two vibrational nano-imaging techniques, scattering-type scanning near-field optical microscopy and tip-enhanced Raman scattering.
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Affiliation(s)
- Boogeon Choi
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Gyouil Jeong
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Hyun-Hang Shin
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
| | - Zee Hwan Kim
- Department of Chemistry, Seoul National University, Seoul 08826, South Korea
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15
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Stanciu SG, Tranca DE, Zampini G, Hristu R, Stanciu GA, Chen X, Liu M, Stenmark HA, Latterini L. Scattering-type Scanning Near-Field Optical Microscopy of Polymer-Coated Gold Nanoparticles. ACS OMEGA 2022; 7:11353-11362. [PMID: 35415325 PMCID: PMC8992282 DOI: 10.1021/acsomega.2c00410] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 03/07/2022] [Indexed: 05/14/2023]
Abstract
Scattering-type scanning near-field optical microscopy (s-SNOM) has emerged over the past years as a powerful characterization tool that can probe important properties of advanced materials and biological samples in a label-free manner, with spatial resolutions lying in the nanoscale realm. In this work, we explore such usefulness in relationship with an interesting class of materials: polymer-coated gold nanoparticles (NPs). As thoroughly discussed in recent works, the interplay between the Au core and the polymeric shell has been found to be important in many applications devoted to biomedicine. We investigate bare Au NPs next to polystyrenesulfonate (PSS) and poly(diallyldimethylammonium chloride) (PDDA) coated ones under 532 nm laser excitation, an wavelength matching the surface plasmon band of the custom-synthesized nanoparticles. We observe consistent s-SNOM phase signals in the case of bare and shallow-coated Au NPs, whereas for thicker shell instances, these signals fade. For all investigated samples, the s-SNOM amplitude signals were found to be very weak, which may be related to reduced scattering efficiency due to absorption of the incident beam. We consider these observations important, as they may facilitate studies and applications in nanomedicine and nanotechnology where the precise positioning of polymer-coated Au NPs with nanoscale resolution is needed besides their dielectric function and related intrinsic optical properties, which are also quantitatively available with s-SNOM.
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Affiliation(s)
- Stefan G. Stanciu
- Center
for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest, 060042, Romania
| | - Denis E. Tranca
- Center
for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest, 060042, Romania
| | - Giulia Zampini
- Department
of Chemistry, Biology and Biotechnology, Perugia University, Via Elce di sotto, 8, 06123 Perugia, Italy
| | - Radu Hristu
- Center
for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest, 060042, Romania
| | - George A. Stanciu
- Center
for Microscopy-Microanalysis and Information Processing, Politehnica University of Bucharest, Bucharest, 060042, Romania
| | - Xinzhong Chen
- Department
of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, United States
| | - Mengkun Liu
- Department
of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, United States
- National
Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Harald A. Stenmark
- Department
of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Oslo 0379, Norway
| | - Loredana Latterini
- Department
of Chemistry, Biology and Biotechnology, Perugia University, Via Elce di sotto, 8, 06123 Perugia, Italy
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